/* Reading Room global nav — prototype */
:root{
  --nv-bg:#FAF7F1; --nv-ink:#33312C; --nv-muted:#96917F; --nv-soft:#6E6A5E;
  --nv-hair:#E7E2D6; --nv-acc:#3E5C76; --nv-accsoft:#EAEFF4; --nv-gold:#8A6D1F;
}
#nv-bar{position:fixed;top:0;left:0;right:0;z-index:900;background:rgba(250,247,241,.92);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--nv-hair);padding-top:env(safe-area-inset-top);}
#nv-row{display:flex;align-items:center;gap:10px;height:46px;padding:0 14px;max-width:980px;margin:0 auto;}
#nv-burger{background:none;border:1px solid var(--nv-hair);border-radius:8px;width:32px;height:32px;
  display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--nv-ink);flex:0 0 auto;font-size:15px;}
#nv-burger:active{background:var(--nv-accsoft);}
#nv-crumb{font-size:12.5px;color:var(--nv-muted);white-space:nowrap;overflow-x:auto;
  scrollbar-width:none;-ms-overflow-style:none;display:flex;align-items:center;gap:6px;flex:1;}
#nv-crumb::-webkit-scrollbar{display:none}
#nv-crumb a{color:var(--nv-soft);text-decoration:none;}
#nv-crumb a:first-child{color:var(--nv-acc);font-weight:800;}
#nv-crumb .sep{color:var(--nv-hair);}
#nv-crumb .here{color:var(--nv-ink);font-weight:700;}
/* on-page section chips */
#nv-chips{display:flex;gap:6px;overflow-x:auto;padding:0 14px 8px;max-width:980px;margin:0 auto;
  scrollbar-width:none;}
#nv-chips::-webkit-scrollbar{display:none}
#nv-chips a{flex:0 0 auto;font-size:11px;font-weight:700;color:var(--nv-soft);text-decoration:none;
  border:1px solid var(--nv-hair);border-radius:99px;padding:3px 10px;background:#fff;}
#nv-chips a:active{background:var(--nv-accsoft);color:var(--nv-acc);}
/* drawer */
#nv-drawer{position:fixed;top:0;bottom:0;left:0;width:292px;max-width:84vw;z-index:920;
  background:var(--nv-bg);border-right:1px solid var(--nv-hair);
  transform:translateX(-102%);transition:transform .22s ease;overflow-y:auto;
  padding:calc(14px + env(safe-area-inset-top)) 0 calc(24px + env(safe-area-inset-bottom));}
#nv-drawer.open{transform:none;box-shadow:0 0 40px rgba(51,49,44,.18);}
#nv-veil{position:fixed;inset:0;background:rgba(51,49,44,.28);z-index:910;opacity:0;
  pointer-events:none;transition:opacity .22s;}
#nv-veil.open{opacity:1;pointer-events:auto;}
#nv-drawer .brand{font-size:15px;font-weight:800;color:var(--nv-ink);padding:4px 18px 10px;
  display:block;text-decoration:none;}
#nv-drawer .brand span{color:var(--nv-acc);}
#nv-drawer .grp{font-size:10px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  color:var(--nv-muted);padding:16px 18px 5px;}
#nv-drawer a.it{display:flex;align-items:baseline;gap:8px;padding:7px 18px;font-size:13.5px;
  color:var(--nv-soft);text-decoration:none;border-left:3px solid transparent;}
#nv-drawer a.it .ico{width:16px;flex:0 0 auto;text-align:center;font-size:12px;}
#nv-drawer a.it:active{background:var(--nv-accsoft);}
#nv-drawer a.it.cur{color:var(--nv-acc);font-weight:800;border-left-color:var(--nv-acc);
  background:var(--nv-accsoft);}
#nv-drawer a.it .hint{margin-left:auto;font-size:10.5px;color:var(--nv-muted);font-weight:400;}
#nv-drawer details{border:none;}
#nv-drawer summary{list-style:none;cursor:pointer;display:flex;align-items:baseline;gap:8px;
  padding:7px 18px;font-size:13.5px;color:var(--nv-soft);border-left:3px solid transparent;}
#nv-drawer summary::-webkit-details-marker{display:none}
#nv-drawer summary .caret{margin-left:auto;font-size:10px;color:var(--nv-muted);transition:transform .15s;}
#nv-drawer details[open] summary .caret{transform:rotate(90deg);}
#nv-drawer details a.it{padding-left:40px;font-size:12.5px;}
#nv-drawer .foot{padding:18px 18px 0;font-size:10.5px;color:var(--nv-muted);}
/* pinned sidebar on wide screens */
@media (min-width:1180px){
  #nv-bar{left:292px;}
  #nv-drawer{transform:none;box-shadow:none;}
  #nv-veil{display:none;}
  #nv-burger{display:none;}
  body.nv-on{padding-left:292px;}
}